框架和面板的应用

//**********************************************//Authority.java    Author: Lewis/Loftus//**********************************************import java.awt.*;import javax.swing.*;public class Authority {//----------------------------//Display some words of wisdom//----------------------------public static void main(String[] args){JFrame frame = new JFrame("Authority");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel primary = new JPanel();primary.setBackground(Color.yellow);primary.setPreferredSize(new Dimension(250,75));JLabel label1 = new JLabel("Question authority,");JLabel label2 = new JLabel("but raise your hand first.");primary.add(label1);primary.add(label2);frame.getContentPane().add(primary);frame.pack();frame.setVisible(true);}}